RichThesaurus
hebetudinous
vs
lethargic
hebetudinous
adj
Displaying mental lethargy or dullness.
lethargic
adj
indifferent, apathetic
sluggish, slow
How often have the words
hebetudinous
and
lethargic
occurred in a corpus of books?
(source:
Google Ngram Viewer
)